About Mark Bieler
Mark Bieler is a director of Phase Change Software LLC.
Experience
This experience comes from official bios and from SEC filings. For roles taken from filings, the years are when the filings name Mark Bieler in the role, so the role may have started earlier or lasted longer.
Phase Change Software LLC Current
Director
2010 – Present · Lakewood, CO
Phase Change Software builds COBOL Colleague, a symbolic AI platform that maps legacy COBOL code into verified business knowledge for enterprises.
Key Colleagues at Startups
The people Mark Bieler works with at each company, as listed on that company's latest Form D.
Phase Change Software LLC · Form D/A, Nov 3, 2026
JD
Jeffrey Diggins
Director
DP
Donald Peskin
Director
GB
Gary Brach
CEO and director
ER
Elizabeth Richards
Executive officer
Howard Culang
Director
BC
Bradford Cleavenger
Executive officer
AK
Alan Kucheck
Executive officer